Temperature - European Investment Bank

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WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD. Mount Coffee HPP ESIA and RAP 2012-09-18 ESIA Report Page 114 m³/s 120 100 80 60 40 20 0 80.00 85.00 90.00 95.00 100.00 Figure 16-3: River flow and plant operation during low flow conditions As stated above (Section 8.2.3), a residual flow will have to be released from the spillway in order to maintain river conditions (and mainly fish and other aquatic organisms) in the section of the river between spillway and confluence with tailrace channel), This amount, proposed as 8 m³/s, is not available for energy production (difference between total and available flow in the Figure). As long as there is a minimum total flow of 42 m³/s, one unit can be operated at 40% capacity, releasing 34 m³/s. This situation is exceeded during 92% of the time, which means that on average during 29 days per year there is less water. During such a condition, water could be turbined for a limited time, and in order to fill the reservoir again, the power plant would have to be shut down for about 4 h for each hour of operation. On days with a flow corresponding to the residual flow, no power production would be possible, since all the water flowing into the reservoir would have to be released as residual flow. This situation will occur on about 1% of the time, i.e. on average on 4 days of the year. 16.2.3.1 Additional Risk Due to Climate Change St Paul River low flow situation % exceedance total flow available flow residual flow 1 unit 100% 1 unit 40% Long term measurements of sea level reveal an increase of about 20 cm during the 20 th century; this is shown in the following Figure.
WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD. Mount Coffee HPP ESIA and RAP 2012-09-18 ESIA Report Page 115 Figure 16-4: Change in sea level during the 20 th century Source: http://en.wikipedia.org/wiki/Sea_level If this development continues, this could obviously create a risk for White Plain water treatment plant, or further deteriorate the already not very favourable condition. Mt. Coffee HPP does not have any influence on this situation. 16.2.3.2 Conclusions and Recommendations The analysis of river flow and plant operation leads to the following main conclusions: � Overall, the influence of Mt. Coffee HPP on river discharge d/s of dam and power house is marginal. � During high flow conditions, i.e. above 340 m³/s (47% of the time, on average 172 days per year), the plant will be operated as ROR plant; there will be no change in river flow as compared to natural conditions. Under these conditions there will be a considerable amount of spilling � During periods with flows between 340 and 190 m³/s (14% of the time, 51 days/year) the plant will be operated with load following. During this period, discharge from the power house will fluctuate between 34 and 340 m³/s, and during a 24 h period, flow will correspond to natural flow. � Under conditions of flows between 34 and 190 m³/s, there are different options for plant operation. It would be possible to operate one unit on a continuous basis at least at the technically feasible minimal rate of 40% (or more as long as more than 34 m³/s are available. The other option would be to operate one or more units for a short time (peak hours) and then closing them down for filling
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Temperature - European Investment Bank

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